This visualization displays a grid of company symbols, each colored by a numeric “rel_score” on a red-to-green scale. Clicking a symbol updates a side panel with the company name, industry, score, and description. The code uses D3 v7 with `select`, `scaleLinear`, and `json` to load and render SVG elements, including a gradient legend and tick indicator. Data comes from a remote JSON file fetched from a gist.